rift is about 80% luck and 20% skills imo, i could be wrong of course.
my best run was 12 wins, even though in ranked i reached rank 5, so i consider myself a veteran.
but rift certainly gives u experience, and a lot of that so feel free to continue rifting.
I really have to disagree. It only depends on luck to reach 9+ victories if u aim for a rare card.
Provided that you won't bump into Adora every single match, you should be able to reach 5 with practically every single deck that u craft from what they give u ( except when u pick 2-3 DoD commander, then u're screw).
The most powerful faction in rift imo = WP and GI: brute force and buff - the more u have them the stronger they are ( avoid mixing these 2 factions though, Artificials and Natures, by its design cores, restrain each other in the same deck)
Then the FD and OOS - though OOS is better used as splash for higher calling and FD is usually better at 2 purity
Then argurably the Exile - they are only good at 2 purity or above (desension, demonic reflextion is the living nightmare) . If splash they only do ok-ish, extremely deadly when 2 Exile 1 DoD
Then the sleeper- however, the sleeper could become tier 1.5 if u can draft triple sleeper and have kyrallic - just don't let flyers crush u down.
The CoV, sadly, only good as a splash faction. not many brute force, and no guarantee that you will get to pick all the good spell there is (they tend to give you crap like beast of burden, verore brute, and the 0/2 card i forgot the name,...)
the factionless... well i've never seen anyone with 3 commander factionless, but i once met someone with zuza, swarmer broodmother and glorious warrior...